低碱金属膨润土在球团矿生产中的应用  

Application of low alkali metal bentonite in pellet production

作　　者：赵路遥 刘长江 乔红梅 韩英广 田筠清 马丽 ZHAO Luyao;LIU Changjiang;QIAO Hongmei;HAN Yingguang;TIAN Yunqing;MA Li(Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Ironmaking Department,Beijing Shougang Co.,Ltd.,Qianan 064404,Hebei,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]北京首钢股份有限公司炼铁作业部,河北迁安064404

出　　处：《中国冶金》2024年第9期86-94,共9页China Metallurgy

摘　　要：降低球团矿中碱金属含量有利于降低高炉碱负荷,因此研究了2种低碱金属膨润土在球团矿生产中的应用情况。研究表明,同样配比条件下,使用2种低碱金属膨润土的球团矿生球落下强度(0.5 m)分别由5.0次提高至5.2次和8.8次,碱金属质量分数分别由基准的0.203%降低至0.142%和0.146%,还原膨胀指数分别由基准的13.8%降低至11.9%和12.7%,低温还原粉化指数I_(RD),>6.3 mm、I_(RD),>3.15 mm和I_(RD),>0.5 mm均有向好趋势。利用其中1种低碱金属膨润土在某钢厂球团矿生产中进行工业试验,结果表明,配加低碱金属膨润土球团矿碱金属质量分数降低0.055个百分点,抗压强度变化不大,还原膨胀指数有降低趋势。在球团矿生产中应用低碱金属膨润土,有利于降低球团矿中碱金属含量,对高炉正常冶炼和高炉长寿均有积极作用。Reducing the content of alkali metal in pellet is beneficial to reduce the alkali load of blast furnace. Therefore, the application of two kinds of low alkali metal bentonite in pellet production was studied. The results show that under the same ratio, the drop strength (0.5 m) of green pellet using these two kinds of low alkali metal bentonite increases from 5.0 times to 5.2 times and 8.8 times, respectively. The mass fraction of alkali metal decreases from 0.203% to 0.142% and 0.146%, respectively. The reduction swelling index decreases from 13.8% to 11.9% and 12.7%, respectively. The low temperature reduction degradation indexes I_(RD),>6.3 mm, I_(RD),>3.15 mm and I_(RD),>0.5 mm have a good trend. One of the low alkali metal bentonites was used in the pellet production of a steel plant. The results show that the alkali metal mass fraction of pellet with low alkali metal bentonite decreases by 0.055 percent point while the compressive strength changes little, and the reduction swelling index has a decreasing trend. The application of low alkali metal bentonite in pellet production is beneficial to reduce the content of alkali metal in pellet, which has a positive effect on the normal smelting of blast furnace and the long life of blast furnace.

关 键 词：低碱金属膨润土 碱金属 还原膨胀指数 低温还原粉化 微观形貌 

分 类 号：TF046.6[冶金工程—冶金物理化学]